Here's a short video showing new Icaros Deskop GUI selection at work. As I said earlier, the new selector will appear at first boot, after installation onto the hard drive (no, doing this also when booting from the DVD-ROM isn't possible and it won't be considered).
Update: in the final release of Icaros 2.2.4, Intuition errors have been fixed. No requester to retry or cancel changes appears.